Coronary Circulation


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Related to Coronary Circulation: Coronary arteries

Coronary Circulation

 

the blood supply to the cardiac muscle, carried by the intercommunicating arteries and veins that run throughout the myocardium.

In man, arterial blood is supplied mainly by the right and left coronary arteries, which begin at the base of the aorta. There are three types of blood supply—right coronary, left coronary, and general—which in some measure determine the nature of the pathology of the coronary circulation in the event of disease of the heart vessels. The coronary veins are both larger and greater in number than the arteries. The veins empty into the right atrium. The principal arterial and venous trunks are connected by a well-developed network of anastomoses, which facilitates collateral (shunt) circulation in cases of impairment of blood supply to the heart.

The great intensity of the blood supply to the myocardium is provided by a dense network of capillaries (approximately twice the number per unit volume than in the skeletal muscles). The level of the coronary circulation in a healthy body corresponds exactly to the force and frequency of the heartbeat. It is regulated both by physical factors (for example, blood pressure in the aorta) and by neural and humoral mechanisms. Coronary circulation is influenced by physical and mental condition and by the degree and character of stress or load. It is sharply impaired by nicotine and certain factors that lead to atherosclerosis, hyper-tension, and cardiac ischemia, such as overstrain of the nervous system, negative emotions, improper nutrition, and the absence of constant physical excercise. Coronary insufficiency and disturbances of coronary circulation are among the most frequent causes of death in economically developed countries, and there-fore their prevention and treatment (mainly of infarction) are the most pressing problems of modern medicine.

I. M. D’IAKONOVA and S. V. SAMOILOVA

References in periodicals archive ?
The only description of balanced coronary circulation in domestic dogs was reported by Andretto et al.
Two weeks before the intervention, one group was asked to prepare for a seminar on brain circulation and the other group was asked to prepare for a seminar on coronary circulation.
We have also found hyperreactivity to thromboxane (Figure 1A) and impaired bradykinin-dependent relaxation in the coronary circulation of young SCH (Figure 1b).
Finally, compared with CCA, MSCT is unable to accurately assess the speed and direction of blood flow in the coronary circulation and across stenotic lesions (64).
In current catheter research, there are 3 main directions with respect to fractional flow reserve (FFR), including instantaneous wave-free ratio, noninvasive measurement of FFR, and FFR transferred from coronary circulation to other ischemia-inducing circulation.
Nearly 90 per cent of untreated patients die within one year, however, a few patients can survive into adulthood with adequate collateral blood supply to the left coronary circulation through dominant right coronary artery (Fig.
For cardiologists, internists, and others, specialists from the US, India, and Guatemala emphasize advances in the understanding of coronary circulation, the molecular mechanisms of myocyte function, and the assessment of regional and global ventricular functions in physiologic and pathologic conditions, and address advances in cardiovascular pharmacology, including the advantages and disadvantages of diuretic therapy, vasodilators, neurohormone modulators, positive inotropic agents, and antilipid, antithrombotic, and antiplatelet agents, and their clinical pharmacology in the management of various cardiovascular disorders.
Although establishing dual coronary circulation in childhood is a common practice, treatment of this anomaly in adult patients is controversial.
The 12 articles in this book intended for cardiologists, researchers, physicians, and medical students consider current topics in the study of the coronary circulation in both smokers and non-smokers.
Understanding the risk of myocardial infarction or bleeding in the setting of non-cardiac surgery with drug-eluting stents present in the coronary circulation is an important factor in deciding appropriate management of these patients.
Key words: Coronary artery abnormalities, Coronary circulation, Ectopic coronary arteries, Coronary artery malformations, Angiography